Improvement in cast-iron sectional boilers



2 Sheets-Sheet 1 I. W. HARD.

CAST-IRON SECTIONAL BOILAER. No.177,635. f Patented May 23,1876.

INVENTOR N.PETERG. PHOTO-UTHOGRAPMER, wAsmNGToN. D C.

ZSheetS-SheetZ. J. W. HARD.

v CAST-IRON sEcTIoNAL BOILER. y

N0.177.'635. f Patented May 23,1876.

wmvesses v. v INVENTOR, @1w/ jg UNITED STATES PATENT EEICE.

JOHN W. HARD, OF DEOORAH, IOWA.

IMPROVEMENT IN CAST-IRON SECTIONAL BOILERS.

Specification forming part of Letters Patent No. 17,635,` dated May 23,1876; application tiled n February 19, 1876.

To all whom it 'may concern Be it known that I, JOHN W. HARD, ofDecorah, in the county of Winneshiek and State of Iowa, have invented anew and valuable Improvementin Cast-Iron Steam-Boilers; and

v boiler, and Fig. 2 is a plan View thereof. Fig.

3 is asectional detail view.

The object of my invention is to improve the construction ofsteam-boilers, as will be hereinafter more fully set forth.

-In the annexed drawings, A represents thev base of my boiler,constructed in any suitable manner to contain the dre-box and ash-pit.-On the interior of thebase Aare suitable lugs or anges a a, to supportthe boiler. The boiler is made in sections, each section consistin gef acircular tube, B, horizontally divided into halves, with two tubulararms, C O, similarly divided, crossing each other at right angles in thecen- Y ter. The tube B is cast with hollow bosses b I), at suitableintervals, on top `and bottom,

and a central hollow boss, d, is also cast at `top and bottom, at theintersection of the arms (J O, as shown.

Each section thus constructed is cast in two parts with suitableflanges, to be bolted firmly together. As many of these sections as maybe desired are placed on top of each other, the bosses corresponding, asshown, and long bolts h passed through, and the sections then fastenedtogether by nuts z' on the ends of said bolts.

1t will be seen that, by this construction, each section forms fourtriangular openings for the passage of the products ol' combustion, andin fastening the sections together they should be turned in such amanner that the tubes Cof each section should be directly over thespaces between the tubes of. the, section immediately below. This isfully shownV in Figs. 2 and 3. In adjustingv the sections of 'the boilerthe center collars d act as turn-tables upon which the sections can beturned properly.

By this construction of the sections B I am able to cast an entiresection without the use of sand-cores.

The feed-water is to enter at the bottom,

and the steam taken out at the top, in .the

usual manner. n

The boiler is surrounded by a wrought-iron jacket or shell, D, supportedupon the base A, and formed with a smoke-outlet, E, at the top. Betweenthe shell D and every alternate section of the boiler is placed anannular plate,

m, to close the space between them, and on the other sections are placedplates n. to close the spaces between the arms O, as fully shown in Fig.l.

By this means, it will be seen, the products of combustion are caused totake a zigzag course-t'. e., from the outside inward, and

from the center outward; or, in other words, theyrst pass around theoutside of the irst section, and, meeting the annular plate m around thesecond settion,vthey are deflected inward .and pass through the insideof the second section; then, meeting the center plates n ofthe thirdsection, they are deected outward and pass around the outside of saidthird section, and so on to the top.

What I claim as new, and desire to securel l JOHN w. HARD.

Witnesses GHAs. WALno, J oNATHAN MILLS.

